ISO 1143 Rotating bar bending fatigue testing Machine

Each specimen is rotated and subjected to a constant bending moment. The force causing the bending moment does not rotate. The specimen can be subjected to single or double point loading in the form of a cantilever beam, or tested as a beam in the form of a four point loading. The test will continue until the specimen fails or reaches the predetermined number of stress cycles, with one stress cycle corresponding to the complete rotation of the specimen.

All specimens in the test series used for fatigue life determination must have the same size, shape, and diameter tolerances. The actual minimum diameter of each specimen should be measured with an accuracy of 0.01 millimeters to calculate the applied force and obtain the required stress. Before conducting the test, care must be taken when measuring the sample to ensure that the surface is not damaged. It is important to follow some recommendations when preparing samples in any rotating rod bending fatigue testing program aimed at characterizing the intrinsic properties of materials.

ISO 1143:2021 is a standard for fatigue testing of metal materials by rotating rod bending, which specifies in detail how to design and perform rotating rod bending fatigue tests to evaluate the fatigue performance of metal materials.

Test objective: To evaluate the fatigue performance of metal materials under rotational bending conditions.

Scope of application: Suitable for various metal materials, including steel, aluminum alloys, etc. Testing principle: The specimen is rotated at a specified speed and subjected to bending load on the testing machine until it fractures or reaches the preset number of cycles.

This standard provides a detailed description of the construction and operation methods of testing equipment, including rotary bending testing machines, specimen fixtures, loading systems, and measurement systems.

Beam type, four points loading

sample preparation

Shape and size: The shape and size of the sample must comply with standard regulations to ensure the accuracy and repeatability of the test results.

Preparation method: The sample needs to undergo appropriate preparation processes, such as cutting, polishing, etc., to ensure a smooth surface and no obvious defects.

Test conditions

Loading speed: According to standard regulations, the loading speed needs to be controlled within a certain range.

Rotation speed: The rotation speed of the specimen on the testing machine must also comply with the standard regulations.

Cycle times: The experiment needs to be conducted until the sample fractures or reaches the preset cycle times. Temperature: The temperature conditions during the testing process also need to be controlled according to standards.